Ubuntu Update for Linux kernel vulnerabilities USN-1130-1
Please Install the Updated Packages.
It was discovered that the Exim daemon did not correctly handle format strings in DKIM headers. An unauthenticated remote attacker could send specially crafted email to run arbitrary code as the Exim user. The default compiler options for affected releases reduces the vulnerability to a denial of service under most conditions.
exim4 on Ubuntu 11.04 , Ubuntu 10.10 , Ubuntu 10.04 LTS